improve logging

server/src/main/kotlin/ir/armor/tachidesk/impl/Extension.kt

@@ -106,8 +106,8 @@ object Extension {
             downloadAPKFile(apkToDownload, apkFilePath)
 
             val className: String = APKExtractor.extractDexAndReadClassname(apkFilePath, dexFilePath)
-            logger.debug(className)
-            // dex -> jar
+            logger.debug("Main class for extension is $className")
+
             dex2jar(dexFilePath, jarFilePath, fileNameWithoutType)
 
             // clean up
@@ -180,6 +180,7 @@ object Extension {
         downloadedFile.sink().buffer().use { sink ->
             response.body!!.source().use { source ->
                 sink.writeAll(source)
+                sink.flush()
             }
         }
     }